摘要：The natural Pozzolana is a siliceous material (SiO2) that reacts with the calcium hydroxide Ca(OH)2 produced during the hydration period of the cement; this inherent feature increases the cementitious property of the grout and improves the compressive strength of the concrete. However, the necessary amount of this material in the concrete composition remains the subject of research to find the adequate rate to meet the expected strength of concrete. In this study, authors investigate the cementing properties of a local Pozzolana called “Tal Shihan” and quantify its role on the compressive strength of cement. Accordingly, to better isolate the effect of Pozzolana from that of cement, two series of batches were formulated for 350 and 400 kg amount of cement of per cubic meter, with a successive increase of the Pozzolana by a rate of 2.5% of the cement weight. Regression analysis was performed that relates the compressive strength versus the Pozzolana rates tested. The results of this study indicate the ability of Pozzolana to improve the compressive strength of concrete. This happens as Pozzolana accelerates the hydration reaction of concrete between the ages of 28–56 days, increasing its strength that is expected normally over the time..
